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Comparison of 1 square metre with some Imperial and metric units of area

The square metre (International spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the SI derived unit of area, with symbol m2.[1]

Adding and subtracting SI prefixes creates multiples and submultiples; however, as the unit is exponentiated, the quantities grow geometrically by the corresponding power of 10. For example, a kilometre is 103 (a thousand) times the length of a metre, but a square kilometre is 1032 (106, a million) times the area of a square metre, and a cubic kilometre is 1033 (109, a billion) cubic metres.


SI prefixes appliedEdit

The square metre may be used with all SI prefixes used with the metre.

Multiplication Name Symbol Multiplication Name Symbol
100 square metre (centiare) m2 100 square metre (centiare) m2
102 square decametre (are) dam2 10−2 square decimetre dm2
104 square hectometre (hectare) hm2 10−4 square centimetre cm2
106 square kilometre km2 10−6 square millimetre mm2
1012 square megametre Mm2 10−12 square micrometre µm2
1018 square gigametre Gm2 10−18 square nanometre nm2
1024 square terametre Tm2 10−24 square picometre pm2
1030 square petametre Pm2 10−30 square femtometre fm2
1036 square exametre Em2 10−36 square attometre am2
1042 square zettametre Zm2 10−42 square zeptometre zm2
1048 square yottametre Ym2 10−48 square yoctometre ym2


A square metre is equal to:

  • 0.000001 square kilometre (km2)
  • 10000 square centimetres (cm2)
  • 0.0001 hectares (ha)
  • 0.001 decares (daa)
  • 0.01 ares (a)
  • 0.1 deciares (da)
  • 1 centiare (ca)
  • 0.000247105381 acres
  • 0.024710538 cents
  • 1.195990 square yards
  • 10.763911 square feet
  • 1550.0031 square inches

See alsoEdit


  1. ^ David R. Lide, ed. (2010), "INTERNATIONAL SYSTEM OF UNITS", CRC Handbook of Chemistry and Physics (90th ed.)

External linksEdit